这次我请客。请让我来买单。
请让我来买单,下次我们吃饭你再请吧。
Please let me pay the bill. You can treat me next time we eat.
请让我来帮您拿行李吧。
We were going to have a clicker slide on how many bounced back but it looks like we're having a little technical difficulty with that.
发生背散射,球被弹回来了的,同学请你们站起来,让我算算。
So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.
那么让我们来做一个小选择题,请大家来告诉我,氟有多少个价电子,要记得,价电子与芯电子不同,它们是在最外壳层的最靠外面的电子。
If you guys wouldn't mind standing up I'll introduce you so you'll put some names to faces.
我来一一介绍,请大家起立,好让大家认识你们
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